Adjustable shore



Sept. 23, 1930.

c. A. KINNINGER ADJUSTABLE SHORE Filed March 29, 1923 gwuwnoz @Hoang LilPatented Sept. 23, 1930 UNITED STATES PATENT OFFICE CARL ANDREWKINNINGER, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO ARTHUR M. KINNINGER,OF DAYTON, OHIO ADJUSTABLE SHORE i Application led March 29, 1923.Serial No. 628,466.

My invention relates to shores or supports, such as are usually employedfor supporting forms for concrete structure, and more particularly to anadjustable shore or strut having a wide range of adaptability.

lVhile the adjustable shore herein shown and described is especiallydesigned for supporting overhead forms for concrete construction, it isto be understood that it is not limited to such purpose, but is alsoapplicable to the construction of staging, scaffolding, as a lateralbrace for a Wall or abutv ment, and for other analogous purposes,wherein an adjustable brace or strut may be advantageous.

In the construction of staging and shoring for concrete forms and thelike, it is the present practice to employ timbers, cut to the requiredlength for one particular job. Such timbers may be reused a second orthird time by recutting and splicing short lengths together. Under suchmethod of cutting and splicing` timbers to fit particular jobs, theperiod of usefulness of the material is quite short. Such methods'arevery wasteful and in view of the increasing scarcity of lumber, and thehigh prices olf such material, these methods are quite uneconomical. Tomeet these conditions, various types of adjustable shores haveheretofore been developed. Many of these embodied automatic clutchdevices, which while sufficient to hold the adjustable members underreasonable strain are not suiiiciently positive to withstand extreme lloads, and moreover such devices as usually f constructed have been toocostly for general use and are too heavy to be economically han- `dledand installed. Y i The present invention contemplates an eX- tensible oradjustable shore, which will be comparatively light in Weight to enableit to be carried and installed by a lone workman but which will besuciently staunch and rigid to enable it to sustain a high maximum load.The shore is further provided with two forms of adjustment of positivecharacter, one of which affords predetermined degree of extension oradjustment while the other by its cooperation will afford intermediatevariations of adjustment,

between the points determined by the primary adjustng means. The presentshore consists of two spaced struts, preferably, though not necessarily,of wood, interconnected at their opposite ends in spaced rela.- tion andhaving telescopic relation with a. length of pipe slidingly mountedintermediate such spaced struts, the pipe having sliding bearing throughthe space plate at the lower end of the struts, While the upper end ofsuch pipe is slidingly engaged with the struts by means of yokes securedto the pipe and embracing the struts. The pipe is provided with a seriesof spaced holes to receive the stop pin, bv which the struts arepositively supporte upon the pipe in any one of several positions. Toafford intermediate degrees of adjustment to fractional ortions of theunits represented by spaced oles in the pipe, there is provided at thelower end of the pipe or standard an adjustable foot, preferably of thescrew jack type. This not only affords accurate fractional adjustmentintermediate the points determined by the spaced holes in the pipe, butit also enables the shore to be firmly and tightly adjusted in positionduring installation, and enables the pressure to be easily and readilyremoved when dismantling the staging or forms.

The object of the invention is to simplify the structure as well as themeans and mode of operation of adjustable shores 0r extensible struts,whereby they will not only be cheapened in construction, but will bemore efficient in use, positivev in ,their engagement in differentpositions of adjustment, capable of being readily and quickly adjustedto fractional degrees of extension, to facilitate installation andremoval, of maximum strength and durability and unlikely to get out ofrepair.

A further object of the invention is to provide a duo-coacting adjustingmeans for such extensible strut or adjustable shores, by which therelatively adjustable portion will be positively locked in theirrelation one with the other.

A further object of the invention is to provide an adjustable shorewhich will be comparatively light in weight thereby enabling it to beeasily and readily transported and and combinations thereof, and themode of operation or their equivalents as hereinafter described and setforth in the claims.

Referring to the drawings, Fig. 1 is a perspective View of theadjustable shore forming the subject matter hereof. Fig. 2 is a detailview of a portion of the shore with one of the side struts removed toillustrate the telescopic adjustability of the parts. Fig. 3 is atransverse sectional plan view on `line of Fig. 1. Fig. 4 is atransverse sectional plan view on line 4-4 of Fig. 1. Fig. 5 is al frontelevation partly in section, having co-acting duo-adjusting meansillustrating the foot of the shore as being universally adjustable. Fig.6 illustrates a fixed adjustable foot or elevating jack for the shore,which is the preferred form for general staging and concrete formconstruction purposes.

Like parts are indicated by similar characters of reference throughoutthe severalviews.

In the preferred but obviously not necessarily the only form ofembodiment of the invention, as has been illustrated in the dra-wing, 1is the main standard comprising a section of pipe having therein atspaced intervals transverse holes'2-2. To preserve the strength of thestandard or pipe, these holes 2 are preferably staggered, that issuccessive holes extend transversely through the pipe at right angles toeach other. This pipe or standard 1 is telescopically mounted inrelation with two spaced struts 3-3, which are preferably' though notnecessarily of wood. The proportions of the pipe and struts may bevaried according-to conditions of use and 'the maximum weight oroverload to be carried. However, for ordinary staging and 'concrete formconstruction, a two inch 'wrought iron plpe has been found sufficientforthe standard 1, while the struts 3 are usually constructed from two byfour studding. It will be understood that these dimensions are givenmerely for illustrative purposes and are not to be interpreted aslimitations. The struts 3 are interconnected at their upper ends by across arm or head 4, which may be of any suitable shape or extent. Inthe present instance this cross arm or head has been shown extendedlaterally somewhat beyond the strut 3, but it may if desired terminateflush with such strut, or be of such extent as is necessitated bythqpurpose for which the shore is employed. At their lower ends thespaced struts 3 are -interconnected by a flanged space plate 5. Thisspace plate 5 in practice isa short section of channel iron or channelbar. However', any other suitable form of interconnection and guide forthe standard 1 may be substituted. The space plate 5 is provided with acentral opening intermediate the struts 3 through which the standard 1extends. The

y upper edge of the standard 1 is flattened as at 6 and secured to suchflattened portion by bolts or rivets 7 are two oppositely disposed bandsor yokes which loosely and slidingly embrace thestruts 3. Theconstruction is such that the standard and strut are longitudinallyslidingly adjustable in relation for such strut in any selected positionof adl justment In order that the stop pin or key may be at hand whenneeded and avoid loss or misplacement, the key is preferably attached tothe strut 3 by means of a flexible cable or chain 10.

At its lower end the standard l is provided with a screw jack oradjustable foot comprising a base 11, from which projects an uprightscrew shaft 12 projecting into the open lower end of the pipe standard 1and provided with an adjustable collar 'or rest 13 threaded upon suchshaft upon which the lower end of the standard 1 abuts. To increase theextent of the bearing surface of the standard on the rest 13-and tostrengthen the lower end of the pipe 1 an ordinary pipe cap 14 isthreaded uponthe lower end of the standard and provided with an openingsufiiciently large to admit the screw shaft 12. To maintain the parts inassembled relation during transportation, the screw shaft 12 isp-referablyrprovided with a transsl verse pin or cotter 15, within' thepipe or standard 1, which by its engagement with the head of the pipecap 14, which forms a flange about the screw shaft receiving opening'limits the withdrawal of the screw shaft from singly. The usual practiceis to loosen the struts slightly, leaving them standing up- `with eachother,'the standard sliding through -It is quite dangerous to remove theshores right-and then by means of attached cables pull the shoressidewise allowing an entire section of forms to fall. If the shore wasquite rigid, necessitating tilting of the base, this method ofcollapsing or wrecking forms could not'bejeffectively accomplished. Theprovisionof the flexible connection permitting wobble movement of thelshore not only accommodates it to irregularities of attach- 'ment andsupport, but permits the shore to be pulled out of perpendicularrelation with the plane of the base to facilitate the Wreckingoperations of forms and false work.V The construction and relation ofthe parts shown in Fig. 6 is similar to that heretofore described,except that the screw shaft 12 is fixedly or rigidly secured to the base11', preferably though not necessarily by being formed integraltherewith.

Within ordinary range of adjustment of the struts and standard the yokes8 afford sufiicient tie between the struts 3 to brace them againstmedial defiection. .However, in an extreme'position of adjustment,wherein the yoke 8 would be brought into proximity to the lower end ofthe strut and face plate 5, it may be found advantageous to tie thestruts 3 medially one tothe other by an intermediate connection. To thisend a hook 16 may be secured to the-inner face of one of the struts 3 ata medial point and a corresponding eye 17 may be positioned upon theinner face of the opposing strut, so that such hook may be engagedtherewith to interconnect the struts and brace them one upon the otheragainst bending or medial defiection. Ample clearance space 18 isafforded inside the yoke 8 as shown in Fig. 3 to enable the yokes toreadily pass such hook and eye when the latter are disconnected. Thenecessity for such interconnection occurs only in the event of aneXtreme degree of adjustment at which time the hook and eyes 16 and 17will be elevated a considerable distance from the end of the standard 1and the yoke 8.

By inserting the stop pin or key in the hole 2 to afford the approximateadjustment of the shore and then adjusting the screw threaded collar orrest 13 the shore may be accurately adjusted to any intermediatefractional degree. Likewise by leaving the collar 13 in a slightlylowered position the strut is readily installed after which thetightening of the collar 13 will secure the strut in place with minimumeffort and a great saving of time. Likewise when removing the shore aturn or two of the collar or rest 13 in reverse direction will relievethe pressure upon the shore and permit its ready disengagement.

In Fig. 5 the space plate 5 is shown provided with a hub or hollow boss5 through which the stop pin 9 projects. The hub 5 not only increasesthe length of the standard bearing but also enables the pin to lock theparts against movement in both directions. This is a great conveniencewhen the shore 1s being carried. The screw adjustment enables i ceptibleof modification in its form, proporr tions, detail construction andarrangement of parts without departing from the principle involved orsacrificing any of its advantages.

While in order to comply with the statute the invention has beendescribed in language more or less specific as to structural features,it is to be understood that it is not limited to the specific detailsshown, but that the means and construction herein disclosed comprisesthe preferred form of several .modes of putting the invention into eHectand the invention is therefore claimed in any of its forms ormodifications within the legitimate and valid scope of the appendedclaims.

Having thus described my invention, I claim:

1. In an adjustable shore, a standard, an adjustable base for saidstandard by which the standard may be raised and lowered, a

pair of struts'extending on opposite sides of said standard andslidingly adjustable relative thereto, toward and from said adjustablebase, a cross head connecting the struts at their upper end, aperforated head connecting the lower ends of said struts, through theperforation of which the standard extends, a transversely perforated hubon said head, a series of transverse spaced holes in the standard, and aremovable pin insertable through the transverse perforations of the huband standard to immovably lock the standard and struts in their adjustedrelation against relative movement in either direction, the interlockedstandard and struts being bodily adjustable in unison by the adjustmentof the ase.

2. In an adjustable shore, a pipe standard, a base for the standard, ascrew stud carried by the base, extending loosely Within the pipestandard, an adjustable collar` on the screw stud, on which the pipestandard loosely rests, a pair of interconnected spaced struts extendingon opposite sides of said standard and slidingly adjustable relativethereto, said struts being Xedly connected one with the other at boththeir upper and lower ends, a transverse pin transfixing the innerconnected strut structure and the standard for immovably interlockingthe standard and struts in adjusted relation against movement in eitherdirection and means for bodily adjustmg the interlocked standard andstruts by adjustment of the adjustable collar on said- 'screw stud. y V

3. An adjustable shore, including a length of pipe comprising astandard, a pair oflstruts 5 extending onopposite sides of the pipestandard, an apertured supporting plate connecting the extreme ends ofthe struts, through which the standard extends, the extremity of thepipe between said struts being flattened, ln oppositely disposed yokesattached to such flattened portion and embracing the struts, and meansfor interengaging the standard and struts in different positions oftelescopic adjustment. A

15 4. In an adjustable shore, two relatively adjustable sections one ofthe sections being a length of pipe provided with transverseperforations at spaced intervals, the other section comprising a pair ofspaced struts ex- 204 tending on opposite sides of the length of pipe, across arm connecting the upper ends 'of the spaced struts, a platecarried by the vother ends of the spaced struts, a sleeve formedintegral with the plate, surrounding .,5 and slidingly adjustable uponthe first mentioned section, said sleeve having therein a transverseperforation brought into registry with different perforations of thefirst section by their relative adjustment, and a in in- 30 'sertabletransversely throughthe registered perforations tolock the shoresections against relative adjustment in either direction.

5. As an article of manufacture, a coupling member for adjustable shoresections, com- 35- prising a'plate, the opposite edges of which 'M areupturned, and a centrally disposed hollow boss on said plate forming asliding bearing and having a transverse perforation.

6. As an article of manufacture, a coupling in member for adjustableshore sections, comprisinga sleeve having laterally projecting Wingportions for engagement with spaced struts, said sleeve affording asliding bearing for an intermediate strut, the sleeve being 4.'.transversely perforated for the reception of va transverse locking pin.y In testimony whereof, I have hereunto set my hand this 21 day ofMarch, A. D. 1923.

CARL ANDREW KINNINGER.

